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php /mysql custom coded forum help needed

I am trying to put together my own forum.

I have a MySQL table called "posts". it has a field called "post_thread_id". Now, if I didn't want to create a separate threads table, how could I set it so that when a new thread is created, "post_thread_id" is set to auto_increment, but when it is a reply to an existing thread, it would use $_GET to grab the current thread_id? I don't think PHP can modify MySQL table attributes on the fly, and I don't know how to use PHP to generate a consistent stream of auto_increment numbers.